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Printhead with variable nozzle firing sequencePrinthead with variable nozzle firing sequence description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080079760, Printhead with variable nozzle firing sequence. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001] The present application is a continuation of U.S. application Ser. No. 11/635,533, filed Aug. 12, 2006, which is a continuation of U.S. application Ser. No. 11,478,598 filed on Jul. 3, 2006, now issued U.S. Pat. No. 7,182,437, which is a continuation of U.S. application Ser. No. 11/144,757 filed Jun. 6, 2005, now issued as U.S. Pat. No. 7,080,895, which is a continuation of U.S. application Ser. No. 09/807,297 filed Aug. 13, 2001, now issued as U.S. Pat. No. 6,902,255, which is a 371 of PCT/AU99/00894 filed Oct. 15, 1999, all of which is herein incorporated by reference. FIELD OF THE INVENTION [0002] The present invention relates to the construction of micro-electro mechanical devices such as ink jet printers. BACKGROUND OF THE INVENTION [0003] In international patent application PCT/AU98/00550, the present applicant has proposed an ink jet printing device which utilises micro-electro mechanical (mems) processing techniques in the construction of a print head driven by thermal bend actuator devices for the ejection of fluid such as ink from an array of nozzle chambers. [0004] Devices of this type have a number of limitations and problems. [0005] It is an object of the present invention to provide various aspects of an inkjet printing device which overcomes or at least ameliorates one of or more of the disadvantages of the prior art or which at least offers a useful alternative thereto. SUMMARY OF THE INVENTION [0006] In accordance with a first aspect of the present invention, there is provided an inkjet printhead having a series of nozzles for the ejection of ink wherein each said nozzle has a rim formed by the conformal deposition of a rim material layer over a sacrificial layer and a subsequent planar etching of at least said rim material layer so as to form said nozzle rim. [0007] The planar etching can comprise chemical-mechanical planarization of the rim material layer and any associated sacrificial layers. [0008] In accordance with a second aspect of the present invention, there is provided an inkjet printhead comprising: [0009] a plurality of nozzle chambers each having an ink ejection aperture in one wall thereof and an actuator interconnection aperture in a second wall thereof; [0010] a moveable ink ejection paddle located within the nozzle chamber and moveable under the control of an external thermal actuator through said actuator interconnection aperture for the ejection of ink out of said ink ejection aperture; [0011] said external actuator being covered by a protective covering shell around the operational portions of said actuator, spaced apart from said actuator. [0012] The protective covering shell can be formed simultaneously with the formation of other portions of the inkjet printing arrangement in particular with the nozzle chamber walls. [0013] The protective covering shell can be formed by deposition and etching of a sacrificial material layer followed by deposition and etching of an inert material layer forming the covering shell. [0014] The external actuator can comprise a thermal bend actuator. [0015] In accordance with a third aspect of the present invention, thee is provided a method of forming an inkjet printhead on a substrate said method including: [0016] providing a first substrate on which is formed electrical drive circuitry made up of one or more interleaved layers of conductive, semi-conductive and non-conductive materials for the control of said inkjet printhead; [0017] forming on said substrate at least one nozzle chamber having an ink ejection aperture in one wall thereof; [0018] providing a moveable ink ejection paddle within said nozzle chamber, moveable under the control of an actuator for the ejection of ink out of said ink ejection aperture; [0019] and utilizing portions of at least one of said interleaved layers as a sacrificial material layer in the formation of one or more of the group comprising said actuator and said ink ejection paddle. [0020] The sacrificial material layer can comprise portions of a conductive layer of the electrical drive circuitry. The electrical drive circuitry can comprise a Complementary Metal Oxide (CMOS) process and the sacrificial material layer can comprise a CMOS metal layer. Continue reading about Printhead with variable nozzle firing sequence... Full patent description for Printhead with variable nozzle firing sequence Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Printhead with variable nozzle firing sequence patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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